Hey Everyone -
I provide IT services to small companies in my area, usually I bill them at month end and recieve payment. Sometimes, for large projects where the customer is extremely happy with the work done they'll give me a comment on my website or testimonial.
However, one of my clients added an additional $25.00 in their check for their invoice. Unfortunately, most of my billing is pretty easy, but this kind of throws me for a loop. How would I balance this?